Process for making multifocal photochromic ophthalmic lens

Details Process for making multifocal photochromic ophthalmic lens Process for making multifocal photochromic ophthalmic lens

1976-01-15

1977-04-12

Bashore, S. Leon

Glass manufacturing

Processes

Devitrifying glass or vitrifying crystalline glass

65 37, 65DIG2, 106 53, 106 732, 106DIG6, C03B 3200, C03B 1108, C03C 304

Patent

active

040172929

ABSTRACT:
Multifocal photochromic opthalmic lenses are produced by nucleating potentially photochromic major lens blanks through heat treatment, combining the nucleated blanks with compatible button or segment glasses, and fusing the combined glasses at temperatures suitable for achieving both fusion and the simultaneous development of full photochromic properties in the previously nucleated major lens blanks.

REFERENCES:
patent: 3966311 (1976-06-01), Korn et al.

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